21994966 has 16 divisors (see below), whose sum is σ = 38509056. Its totient is φ = 9225576.

The previous prime is 21994897. The next prime is 21994981. The reversal of 21994966 is 66949912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16056 + ... + 17371.

It is an arithmetic number, because the mean of its divisors is an integer number (2406816).

Almost surely, 2^21994966 is an apocalyptic number.

21994966 is a deficient number, since it is larger than the sum of its proper divisors (16514090).

21994966 is a wasteful number, since it uses less digits than its factorization.

21994966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33483.

The product of its digits is 209952, while the sum is 46.

The square root of 21994966 is about 4689.8791029194. The cubic root of 21994966 is about 280.1825595171.

The spelling of 21994966 in words is "twenty-one million, nine hundred ninety-four thousand, nine hundred sixty-six".